Dr Taweesin Visanuyothin, spokesman of the government's Centre for Covid-19 Situation Administration, said on Saturday (April 18).
He added that if they fell ill, they should rush to check their condition at a hospital.
He said he was shocked to learn about the mass gathering, standing in a long queue to pick up food donations without social distancing, which exposes them to the infection risk.
He also asked people planning to provide similar donations to come up with a good system to manage the way people stand in the queue.